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In order to make full use of the historical data which is evaluated in the security assessment work of power supply enterprise, the data has been re-analyzed and organized. The data warehouse for security assessment was built based on the existing security assessment management system. The data cube of the star type mode was introduced, and the data information was analyzed multi-angle and deep seated by online analytical processing and data mining techniques. Based on ASP.NET technology, OLAP report has been displayed on the WEB page and more effectively scientific basis were provided for the users.